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It wasn’t what Professor Mark Jacobson was saying—if you’re an advocate of renewable energy, you hear this kind of talk on a daily basis—as much as it was the platform. Solar and wind energy simply don’t get the late-night limelight.

David Letterman helped change that in October by inviting the best renewable power spokesman you could have hoped for—an academic who had co-written a 100-percent renewables plan for Scientific American four years earlier. Watch the above videos to hear his thoughts on going green.